Little Andrus Lake

Little Andrus Lake comes in at a B on the grading rubric — a respectable showing for a Minnesota lake of its size and depth. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

Mesotrophic conditions dominate at Little Andrus Lake: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. A maximum depth of 37 ft puts Little Andrus Lake in the middle of Minnesota's depth distribution. Little Andrus Lake is small — 27 acres alongside 1.0 miles of shoreline — which makes it sensitive to even modest changes in watershed runoff or recreational pressure. Within Cass County's 133 graded lakes, Little Andrus Lake ranks 95 — below the local median, though not at the bottom.

No invasive species are currently listed at Little Andrus Lake — the lake remains off the Minnesota infested-waters roster. The state fisheries records do not list documented species for Little Andrus Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. The lake lacks a documented public access point, so visitor use is limited. Monitoring depth is thin here: the LakeGrade rubric is applied to a small number of sample years, and the grade will be revised as more data accumulates.